[zedman3d]

CPU: Intel Core 2 Duo E7200 Wolfdale 2.53GHz - $130
Newegg.com - Intel Core 2 Duo E7200 Wolfdale 2.53GHz 3MB L2 Cache LGA 775 65W Dual-Core Processor - CPUs / Processors

Motherboard: ASUS P5K SE EPU LGA 775 - $89
Newegg.com - ASUS P5K SE EPU LGA 775 Intel P35 ATX Intel Motherboard - Intel Motherboards

Case: COOLER MASTER RC-690-KKN1-GP - $84
Newegg.com - COOLER MASTER RC-690-KKN1-GP Black SECC/ ABS ATX Mid Tower Computer Case - Computer Cases

Ram: G.SKILL 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 - $45
Newegg.com - G.SKILL 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Desktop Memory

VideoCard: POWERCOLOR Radeon HD 4850 512MB - $200
Newegg.com - POWERCOLOR AX4850 512MD3-H Radeon HD 4850 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Desktop Graphics / Video Cards

PSU: Rosewill RP500-2 ATX12V v2.01 500W - $45
Newegg.com - Rosewill RP500-2 ATX12V v2.01 500W Power Supply 115/230 V CSA, UL, TUV, FCC - Power Supplies

Harddrive: Seagate Barracuda 7200.10 160GB - $48
Newegg.com - Seagate Barracuda 7200.10 ST3160815A 160GB 7200 RPM 8MB Cache IDE Ultra ATA100 Hard Drive - Internal Hard Drives

DVD Drive: LITE-ON 20X DVD±R DVD Burner with LightScribe - $37
Newegg.com - LITE-ON Black 20X DVD+R 8X DVD+RW 8X DVD+R DL 20X DVD-R 6X DVD-RW 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2MB Cache SATA DVD Burner with LightScribe - CD / DVD Burners

Total: $680 USD - $345 Pounds

Thats one i made for someone else earlier. I understand that prices vary from country to country but currently your build needs tweaking.

Either try and get something like the above or modify your one buy getting a BrandName PSU thats trusted, ie Corsair, Antec and then choose the 5000+ because its a good overclocker.